Improvement in dies for manufacturing tin-lined lead pipe



UNITEDV STATES PATENT OEEicE W. ANTHONY SHAW, OF NEW YORK, N. Y.

IMPROVEMENT IN DIES FOR MANUFACTURING TIN-LINED LEAD PIPE.

Specification forming part of Letters Patent No. 56,622, dated July 24, 1866.

To all whom it may concern:

Beit known that I, W. ANTHONY SHAW, of the city and Acounty and State of New York, have invented certain new and useful Improvements in Dies used in the Manufacture of Tin- Lined Lead Pipe; and I do hereby declare the following to be afull, clear, and exact description of the same, reference being had to the annexed drawings, making part of this specification, in which- Figure l is a plan of the top of said die, and Fig.2 is a transverse vertical section taken through the center thereof.

In manufacturing tin-lined lead pipe after the manner of my patent granted on the 10th day of March, 1863, the die forming the bottom ofthe cylinder of the press becomes injuriously hot, and thelead, owing to its superior density, does not compress so much as the tin under the operation of the ram, so that when the pressure is first applied the lead forces a part of the bottom of the tin ingot out through the die before the tin has been pressed to the density due to the force necessary to press it through the die; or, in other words, the proportion of space occupied by the tin and lead, respectively, before compression is not the same as it is after compression, the lead being in excess, the effect of which is to `make the tin lining in the end of the pipe, formed when the pressure is first applied, too thick, and inthe part formed by the last part of the charge too thin, so that to get the tin lining of uniform thickness it is necessary to provide' some means of escape for this excess ot lead.

To provide a means of escape for this excess of lead and a means to keep the die cool is the object of this invention, which objectI accomplish in the following manner-that is to say:

To keep the die cool I apply to it a ringr or coil of pipe, as shown by H, which in this case is introduced in 'a cavity made in the lower side of the die, around the mandrel-O. Through this ring of pipe I maintain a circulation of water by the agency of two pipes, f and c, the one being an ingress and the other an egress pipe. The ring or coil H should be so made as to present as much surface to the die as possible, and the upper part may be perfo`rated,if necessary,so as to throw a spray of water against the die, the object being to cool the die either by the cool surface of the ring H or by throwing against it a spray of Water.

To provide means of escape for the excess of lead, so as to insure a lining of tin of uniform thickness, I make escape-holes b in the die, through which the lead can escape when the pressure is rst put upon the two metals in the cylinder. These holes may be made in the sides of the cylinder, near the bottom, or in the ram; but in either place the effect will be the same. I do not. therefore, mean to confine my claim to the form or location of the opening providing a means of escape for the lead from the cylinder; but

What I claim, and desire to secure by Letters Patent, is-

l. Insuring a lining of tin of uniform thickness by providing an escape for the lead either through the cylinder, die, or ram.

2. The die A, in combination with the pipe H, when the two are constructed and arranged in relation to each other substantially as dedescribed.

W. ANTHONY SHAWT/ Witnesses AMos BROADNAX, G. L. KNOX. 

